CSS reference

This CSS Reference shows the basic syntax of a CSS rule; lists all standard CSS properties, pseudo-classes and pseudo-elements, @-rules, units, and selectors, all together in alphabetical order, as well as just the selectors by type; and allows you to quickly access detailed information for each of them. It not only lists the CSS 1 and CSS 2.1 properties, but also is a CSS3 reference that links to any CSS3 property and concept standardized, or already stabilized. Also included is a brief DOM-CSS / CSSOM reference.

Note that CSS rule-definitions are entirely (ASCII) text-based, whereas DOM-CSS / CSSOM, the rule-management system, is object-based.

See also Mozilla CSS Extensions for Gecko-specific properties prefixed with -moz; and WebKit CSS Extensions for WebKit-specific properties. See Vendor-prefixed CSS Property Overview by Peter Beverloo for all prefixed properties.

Keyword index

justify-content

Others

--*

Selectors

Basic Selectors
- Type selectors elementname
- Class selectors .classname
- ID selectors #idname
- Universal selectors * ns|* *|*
- Attribute selectors [attr=value]
Combinators (more info)
- Adjacent sibling selectors A + B
- General sibling selectors A ~ B
- Child selectors A > B
- Descendant selectors A B
Pseudo-elements (more info)
Standard pseudo-classes (more info)

A complete list of selectors in the Selectors Level 3 specification.

CSS3 Tutorials

These small how-to pages describe new technologies appeared in CSS3, or in CSS2.1 but with low support until recently:

Concepts

DOM-CSS / CSSOM

Major object types:

document . styleSheets
styleSheets[x] . cssRules
cssRules[x] . cssText (selector & style)
cssRules[x] . selectorText
elem . style
elem . style . cssText (just style)
elem . className
elem . classList

Important methods: